4S1X:
reference: A Switch from Parallel to Antiparallel Strand Orientation in a Coiled-Coil X-Ray Structure via Two Core Hydrophobic Mutations., Malashkevich VN, Higgins CD, Almo SC, Lai JR, Biopolymers. 2015 Mar 6. doi: 10.1002/bip.22631. PMID: 25753192

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).